Chiller tripped

We have 7nos of Centrifugal chiller Mc-Quay.640Tr each.

Our Chiller no.07 frequent tripped as per Alarm below:

 

15-06-09 18:01:20 COMPR STOP - Oil Delta Pressure Low #1
15-06-09 18:06:53 COMPR STOP - Oil Pressure Low - Start #1
15-06-09 18:08:13 COMPR STOP - Oil Pressure Low - Start #1
15-06-09 18:15:38 COMPR STOP - Oil Pressure Low - Start #1
15-06-09 18:25:19 COMPR STOP - Oil Pressure Low - Start #1
15-06-09 19:13:21 COMPR STOP - Oil Pressure Low - Start #1
15-06-09 19:20:54 COMPR STOP - Oil Pressure Low - Start #1
15-06-09 19:22:21 COMPR STOP - Oil Pressure Low - Start #1
15-06-09 19:50:44 COMPR STOP - Oil Pressure Low - Start #1
15-06-09 21:28:23 COMPR STOP - Oil Pressure Low - Start #1
15-06-09 21:34:35 COMPR STOP - Oil Pressure Low - Start #1
16-06-09 7:24:36 COMPR STOP - Oil Sump Temp Sensor Out of Range #1
16-06-09 8:33:50 COMPR STOP - Oil Pressure Low - Start #1
16-06-09 8:35:49 COMPR STOP - Oil Pressure Low - Start #1
16-06-09 8:37:57 COMPR STOP - Evaporator Water Flow Loss #1

After checking,we found that lux for cable connector burned.Any body can help me to resolve this problem

thanks guys

-hamdan-

  • Hamdan,

    It is hard to do a long distance troubleshoot. I am going to figure you fixed the cable connector and that you want to resolve the trip problem.

    Is this the total number of trips you have experienced?

    The oil pressure trips should require a manual reset. Was an operator resetting on the evening of the 15th and left at 21:34? The Oil Temp Out Of Range could have been from shutting off power to the chiller at that time.

    Did an operator return the morning of the 16th and try to restart from 7:24 until 8:37? Would the Evaporator Flow loss be cause by isolating the machine?

    If you have 7 chillers and this is No. 7 is it at the end of a header or loop where it may have low CW flow and a low Delta T? Check differentials with the same gauge, move it to test.

    Does the evaporator use a refrigerant that operates at less than atmospheric? The oil pressure would be the difference between the evaporator pressure and the pump output. A little more on a vacuum machine; less on at pressurized one.

    Evaporator pressure is a function of oil pressure. Is this machine starting unloaded? It should be and once stabilized the load can be brought on. I am asking this because your trip times are sometimes 5 minutes or so apart. The should be a compressor coast down time anti restart of about 5 minutes minimum. You might be dropping the evaporator pressure too soon at startup.

    Those are  few thoughts that may spark an idea. You can email me at dailyops@frontiernet.net if you would like to explore other issues.

    Thank you, Bernie Daily

  • The alams you are getting may indicate that you are pumping oil out of sump.  Is the chiller compressor a recip, scroll, or screw machine?  You may be getting liquid refrig back to compressor.  What is your superheat?  Is there an oil sump heater and is it working?  Does this alarm occur under low load conditions?  Has it always done this or hasit just started doing this recently? Answer a few of these questions and we can get closer to the problem solution.

    Butch Yates

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